Volvo FM Handbook page 326

Electrically heated mirrors
Press once on button 1 to start electrical heating for 30
minutes. The indication lamp in the button flashes.
Heating stays on for 30 minutes.
Hold button 1 in longer than 1 second to start the
electrical heating. The lamp in the button lights. The
heating is on until the engine is switched off.
Electrically operated driving mirrors
1 Select which mirror is to be adjusted with the
buttons at 3
L for the left side mirror and R for the right side
mirror.
The lamp in the button lights.
2 Adjust the mirror with lever 3
The lamp in the button goes out after 10 minutes.
Further adjustment requires the mirror to be selected
again.
Cab 315
J8008391
J8008391